Suppression of 2D superconductivity by the magnetic field: quantum corrections vs superconductor-insulator transition

TL;DR

This paper investigates how magnetic fields suppress 2D superconductivity in NdCeCuO films, comparing quantum correction theory and superconductor-insulator transition models to explain experimental magnetotransport data.

Contribution

It provides a comparative analysis of quantum corrections and superconductor-insulator transition models in explaining magnetic suppression of 2D superconductivity.

Findings

Quantum corrections qualitatively match experimental magnetoresistance.

High-field negative magnetoresistance explained by quantum correction theory.

Crossover between quantum corrections and SIT models discussed.

Abstract

Magnetotransport of superconducting Nd_{2-x}Ce_xCuO_{4+y} (NdCeCuO) films is studied in the temperature interval 0.3-30 K. The microscopic theory of the quantum corrections to conductivity, both in the Cooper and in the diffusion channels, qualitatively describes the main features of the experiment including the negative magnetoresistance in the high field limit. Comparison with the model of the field-induced superconductor-insulator transition (SIT) is included and a crossover between these two theoretical approaches is discussed.